Back-stop for elevator-heads.



F, H MEUUEEN. 3mm STOP ma ELEVATOR HEADS.

A PPLICAIHIIN FSLED NM 1. 1917. 1,283,539.

FIG, --2

IN VE N TOFP I W/ T/VESGES F/NLAY R. MCQUEEN aim 6711a AT TORNE Y6.

Mtoutod Nov. 5, 1918.

F. R. McQUEEN. BACK STOP F08 ELEVATOR HEADS.

APPLiCATiDN FILED JUNE 1! I917.

lafvnfed Nov. 5, 1918. 2 5HEET5-SHEEI 2 2 6 W W c E E Y CW. w m 6 m V/ O O O O 3 w G 1 r 5:

W1 rm 55.5 4 1 A T TORNE Y5.

UNITED STATES PATENT OFFICE.

FINLAY R. MCQUEEN, 0F MINNEAPOLIS, MINNESOTA.

BACK-STOP FOR ELEVATOR-HEADS.

Application filed Jiine 1, 1917'.

To all whom it may concern:

Be it known that I, FIXLAY R. MCQUEEN, a citizen of the United States, resident of hfinneapolis, county of Hennepin, State of .Minnesota, have invented certain new and abrupt stop, as provided for in the met-hanism of my former patent.

The invention consists generally in vari ous constructions and.colnbinations, all as hereinafter described and particularly pointed out. in the claims.

In the accompanying drawings forming part of this specification,

Specification of Letters Patent.

Fi ure 1 is a )lttll view of an ctevaton head having my improved back stop applied thereto.

Fig. 2 is a side cit-within ot' the same Fig. 3 is a plan vii-vi pa tially in section, showing in detail the application of the invention to the pulley,

Fig. 4 is a sideelevation of the same,

Fig. 5 is a detail view, showing the 1nannor of connecting or anchoring one. end of the brake strap.

In the drawing, :2 represents the supporting bars or timbers of a grain e1evator,having mounted thereon in suitable boxes 3 a head shaft t carrying a head pulley 5. The elevator belt 5 equipped with a series of buckets 7 passes over this head pulley in the usual Way and all these parts may be of any ordinary Li. referred construction. The shaft 4 is driven by any suitable means,

preferably an electric motor, (not shown).

Patented Nov. 3, 1918.

Serial No. 172,234.

a reverse movement of the belt and head pulley and will often seriously damage the operating na-chanism.

To obviate this objection. I provide up n the shaft -t a suitable brake wheel 5 ha v ing! a peripheral friction surface S). A plate it) is slidably mounted on a support 11 and adjustable thereon by means of tlti ll willlg screws 12 mounted in angle have 13 on aid support and engaging the side plate. shaft 14 is mounted in bearings 15 on sat-l plate and carriys bars lti having; guides 1T therein l'or bearing blot-ks is in which tittshut t 1!) of a friction wheel it! imounted and normally held toward inc wheel by compression springs 21. The pressure of this wheel on the wheel 9 may be increased or decreased by the adjustment of the plate 10. These bars are arranged to tilt to the position shown in Fig. l. or swing down wardly to the position shown in Fig. 4. The frame is in the normal position when the elevator is at work, but in case of a. breakage, or stopping of the elevator occurs for any reason, so that. bacl-zward movement of the buckets takes place. then the frictional engag'emcnt of the wheel 9 with the wheel 20 will cause them t assume the position shown in Fig. l aml the chains -42. which normally have the function of limiting the upward movement of the bars lti, will become Hindi i; as shown in Fig. -i.

For the purpose of gradually checking backward movement of the elevator and the wheel 9, I provide a brake band .23 attached at 24: to a beam 25 and mounted on a rod :26 at its other end in bars 16 below the shaft H, so that when the bars 16 are swung on said shaft as a center. the brake band will be either loosened or tightened, depending upo the direction of movement of the bars. If they are raised to the, position shown in Fig. 2, then the band will be loosened and the wheel 9 will turn freely, but when the bars are drawn down by the frictional engagement oi the wheels 9 and 2 0 with each other, then the brake band will be put under tension as its pivotal connection with the bars swings down uiider the pivot I L and the fiber shoes 27 mounted on the brake band will grip the surface of the wheel with sufficient pressure to gradually "check its backward movement without shock or jar to the other mechanism of the apparatus. I

am able, therefore, to gradually check backln'vali'agv UHHl'H or in cash the rlcvalm' ls alop iud and lhiloailod lJllllfllH hugin lo ll'VHlYQ llH wheel liai'liwaidlv or in the up poaiic diri-i-tion to that in which it noiinall 1110\15 whrn the l uclcols arillLHlilllQ" the grain.

1n \arioni ways llif dclails ol' i-niisirniv lion hum-in shown and dvwrilwd may In: modified and still b0 within the mi'UllU kil my invention.

I claim an my invention:

1. A back stop for lilUVllliOl' heads coin-- priaing a shall, a liralnwhen] mounted hm-"on, a frame pivoted for oscillalinn in Ihv ilaniof said ii'llill. a iiiiringj-avliialiwl l'l'iirlion n'hvul i'arriml l1 .waid l'rainn in 4n gagv tin ii-,riplir-r ol mid hialiiwhirl a liralw ll'iliil iiiolall r llflllhl'lml l mu- (Nil ailjau nl -a il liiallw \ilmnl and partially i-n in-ling iii min and liming l iali'i sli -i l nr ungugwnwni i iih r al l \vlnil, the mimrnd of dill -ialqv hand liaiing an ww ilili'll, pivotal villain-(lion \\llll said li'zililii. vanilla lion of said llalnu i'iiioi'ating Lo lnosi'n r tighti-n mid hand on said brake wheel.

2. A hark slop for i-lniator heads cmnl'niw ing a shaft, a brake wheel mounted thereon and having a pei'lplioial friction surf-ave. a frame iii'oti-d at one and to sw'ig toward and from {his pci'iplni'y (if said win-cl, a l'rii-lion wlnwl slidal'ily mounted in said frame for i-ngagenicnl with lilnpilllirllilill siHlar-ei' said lHzllfl heal, a lii'ali =lia i i rii'liall illlli' 'llllg snlil hiall: \\l'iiil anal ionnvi-tial to said frame (-m'unti'ivall Willi ii'siiwi in The" pivot lliul'uof. l l ul wai-il 1m inanl o mid lilillfl? .CllWl wig-aging ii niih Raid frirti n wheel and aii'ingiing -aid lranw dinnnn-irdly id tighten blil hralu; 1 Pal.

i\ hack stop for ClBVdlUI llUHLl iHllilJllS' ing a shaft, a brake WllQOl sna'nrial thereon hai ing a peripheral friction sin-fawn, a frame composed of side bars pivoted at one end for movemrrnt in a vertical plane parallel with the plann (if said Wliuul, bOXls' slid-ably inonnivd in mill (l liars, springs for normally holding mid boxes toward said hraki": wheel with a yielding ])ll'HJ-1lll( a fl'lPl lOl) wheel joni'nalnd in aaid boxer. and having a yield ing Contact with said hraln: WllQOl, a brake hand sm'ulud at one end and partially on ill'(,ll\ig' aid hralm wheel and connected with said bars below and adjacent the pivots thereof, haukvard IHOVUHNUE of said brake. \i'lmcl tilting Said bars downwardly and tightening said brake band on said brake wheel.

l. A hark atop for elevator heads coniprising a shaft. i hralie wheel mounted thereon and liminga pui-iphrral l IlP-llUHvHlI'flHU a aprimgnrinaivd ll'lll'lfill nhvvl illfliiglffiil lo mniavi, n'ilh said siiifacv, a pivoted l'ianw win-win said irlwcl in 11l lllll'((l and iolil h='1i\ hnld Inward -=aiil lirliv wlii-vl. a brain hand inonnir l lu mniai'i a ilh ihv iwripliri of mid liraki whi'vl and attarhvd to said lianiiw: uvntrhially Willi iwpr-vl lo llll, iiiW-L lli-L'JT'HL l)l(l(\\'lllil lllUYilHLlll ol mid liiiihi vrhvnl igngag ing said i'riclinn whvvl in till naid frame downiiaidly and set said liralm hand. and forward nioi'on iont 0i? said brake whvvl lifting said frainn and fllQl'lUli wliei-l io rvlu=n-t0 Said band.

A hack stop for nlovnloriii-ads rmnpris iiig a nhai l, a liiiali'n whorl nionnlrd thcl'con, a tilting; l'rann a flltilflll nhovl cai'l'ivd thyroljiy and yivldingly hold toward the PW nwni of said liralcii whwl lilting said l'ric iion \i'hiwl and l'rainiand hai-hward inovw lllllll. of said lnalil iihnvl rngaging said Friclion \i'liool in nioio it pa? llin (i-liter of UN plii ls oi mid l'iillii ii'hnvl and said Frana. and a hraltr strap engaging said fllfltlflll whvel and cmnn 'uied with said frame to ho loosened or tightvned by the ninvement there-0f.

In witness whoreofl I have hereunto svt my hand this, 26th day of May, 1917.

FINLAY Ii. M'GQUEEN. 

